US4228945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Food carton for microwave heating
Assignee: WestRock Minnesota Corp
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Filing: 1979-03-05
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Granted: 1980-10-21
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Expires: 1999-03-05
Abstract
Abstract Disclosed is a carton which is especially adapted for heating food products in microwave ovens. The bottom surface of the carton is cut to define a plurality of spaced apertures, each of which is closed by removable means. A strip of film is secured to the bottom surface of the carton and the removable means so that, upon removal of the film prior to heating, the means are removed with the film to provide vent holes which allow moisture vapor generated during heating to escape. In a preferred embodiment, the carton has two separable compartments joined by a common top and two common side walls with an intermittent cut line extending across the top and down the common side walls to permit separation of the two compartments. The compartments have individual bottom panels, each of which is cut to provide a plurality of removable tabs held within spaced apertures by spaced nicks.
Inventors
- 👤 Lawrence S. Wysocki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:19
CPC Classifications
B; B65; B65D; B65D81/00; B65D81/34; B65D81/3446; B65D81/3453; B65D5/00; B65D5/42; B65D5/4295; B65D5/54; B65D5/5495; B65D2205/00; B65D2581/00; B65D2581/34; B65D2581/3437; B65D2581/3439; B65D2581/3459; B65D2581/346; Y; Y10; Y10S; Y10S229/00; Y10S229/902; Y10S229/903
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
359 words
A two part severable carton having venting apertures therein comprising: first and second bottom panels each having a plurality of spaced tabs formed integrally therein, each of said tabs being defined by spaced cut lines to facilitate the removal of said tabs; a strip of film secured to the undersurface of each said bottom panel by an adhesive applied to the bottom face of each said tab, said strip being secured in a manner to permit its removal from said bottom panels while remaining adhered to said tabs to thereby remove said tabs from said bottom panels to define venting apertures therein; a pair of opposed first side wall panels hingedly connected to each said bottom panel and extending upwardly therefrom; a pair of opposed end wall panels hingedly connected to the free edges of each said bottom panel and extending upwardly therefrom, with one of said end wall panels associated with each bottom panel being disposed in face to face abutting relationship and being adhesively connected at discrete locations therebetween; a common top panel extending over both said bottom panels and being disposed parallel thereto, said top panel being hingedly connected to the top edge of the other said end wall panels; a pair of opposed, common second side wall panels hingedly connected to the free side edges of said common top panel and extending downwardly therefrom, said second wall panels being disposed outwardly of said first side wall panels and being adhesively secured thereto, said second side wall panels extending below the plane of said bottom panels to support said bottom panels in spaced relation to a surface upon which said carton is placed; and said top and second side panels including a continuous line of perforation, said perforated line being disposed perpendicular to the hinged connection between said top and second side panels and lying in a plane coincident with the plane between said adhesively secured end wall panels whereby said carton may be separated into two individual parts by severing said line of perforation and breaking said adhesive connection between said one end wall panels thereby enabling the separation of said parts of said carton.
Claim 2
Dependent Claim
359 words
A two part severable carton having venting apertures therein comprising: first and second bottom panels each having a plurality of spaced tabs formed integrally therein, each of said tabs being defined by spaced cut lines to facilitate the removal of said tabs; a strip of film secured to the undersurface of each said bottom panel by an adhesive applied to the bottom face of each said tab, said strip being secured in a manner to permit its removal from said bottom panels while remaining adhered to said tabs to thereby remove said tabs from said bottom panels to define venting apertures therein; a pair of opposed first side wall panels hingedly connected to each said bottom panel and extending upwardly therefrom; a pair of opposed end wall panels hingedly connected to the free edges of each said bottom panel and extending upwardly therefrom, with one of said end wall panels associated with each bottom panel being disposed in face to face abutting relationship and being adhesively connected at discrete locations therebetween; a common top panel extending over both said bottom panels and being disposed parallel thereto, said top panel being hingedly connected to the top edge of the other said end wall panels; a pair of opposed, common second side wall panels hingedly connected to the free side edges of said common top panel and extending downwardly therefrom, said second wall panels being disposed outwardly of said first side wall panels and being adhesively secured thereto, said second side wall panels extending below the plane of said bottom panels to support said bottom panels in spaced relation to a surface upon which said carton is placed; and said top and second side panels including a continuous line of perforation, said perforated line being disposed perpendicular to the hinged connection between said top and second side panels and lying in a plane coincident with the plane between said adhesively secured end wall panels whereby said carton may be separated into two individual parts by severing said line of perforation and breaking said adhesive connection between said one end wall panels thereby enabling the separation of said parts of said carton.
Claim 3
Dependent Claim
33 words
A two part carton according to claim 1 wherein said adhesively connected end panels are cut to a depth of from about 20% to 60% of the wall thickness in the areas adhered.
Claim 4
Dependent Claim
47 words
A two part carton according to claim 1 wherein the portions of said line of perforation formed on said second side wall panels comprise pairs of spaced intermittent cut lines which define pull tabs adapted to be grasped and pulled to separate said second side wall panels.
Claim 5
Dependent Claim
11 words
A blank for forming a carton as defined in claim 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-21 | 1984-04-21 | 1984-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-21 | 1988-04-21 | 1988-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-21 | 1992-04-21 | 1992-10-21 | $7700.00 | Window Closed / Lapsed |